Journal
ENVIRONMENTAL RESEARCH
Volume 239, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.envres.2023.117227
Keywords
Bimetallic modification; Crab shell; Biochar adsorbent; Tetracycline and phosphate adsorption
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In this study, an efficient lanthanum ferrate magnetic biochar was synthesized and its performance and mechanisms for phosphate and tetracycline adsorption were investigated. The material showed high adsorption capacity and excellent performance in practical wastewater applications.
Excessive phosphate and tetracycline (TC) contaminants pose a serious risk to human health and the ecological environment. As such exploring the simultaneous adsorption of phosphate and TC is garnering increasing attention. In this study, an efficient lanthanum ferrate magnetic biochar (FLBC) was synthesised from crab shells using an ultrasound-assisted sol-gel method to study its performance and mechanisms for phosphate and TC adsorption in aqueous solutions in mono/bis systems. According to the Langmuir model, the developed exhibited a maximum adsorption capacity of 65.62 mg/g for phosphate and 234.1 mg/g for TC (pH:7.0 +/- 0.1, and 25 degrees C). Further, it exhibited high resistance to interference and pH suitability. In practical swine wastewater applica-tions, whereby the concentrations of phosphate and TC are 37 and 19.97 mg/L, respectively, the proposed material demonstrated excellent performance. In addition, electrostatic adsorption, chemical precipitation and ligand exchange were noted to be the main mechanisms for phosphate adsorption by FLBC, whereas hydrogen bonding and 7C -7C interaction were the main adsorption mechanisms for TC adsorption. Therefore, this study successfully prepared a novel and efficient adsorbent for phosphate and TC.
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